Somehow this one escaped.

A test case for sorting of custom attributes.

Changed default extrusion stepping to 1 segment, smaller default tessellation is usually preferable (for flat surfaces).

Thanks to @fazeaction for spotting this.

All three classes are now in separate files.
Updated build script.
Fixed runaway globals.
Optimized loops ("in" should be used just for iterating over object properties, for arrays it's slow and also traversal order is not guaranteed).
Cleaned whitespace.
Bit more polished example.
Fixed inverted side faces for fish shape.

Gah, these things are pain to debug - "undefined" value in uniforms can lead to very weird behaviors.